For the snap closures I had to change the construction 4 times to make it work.
I'm 90 percent satisfied with the result. The material is quite brittle (I took PET),
but if you use the snap lock carefully, it works well. Once the closure has closed,
it is no longer subject to bending.

I have printed the snap closure with a more flexible material (Innoflex 45).
When printing there were no problems. I took the following settings:
Temperature 230 °
Built plate temp 70 °
Retraction distance 6.5 mm
Retraction speed 25 mm / s
Fan speed 100%
front door
Hood

I find the material megacool because it is very flexible.
But for the snap closure, it is not suitable. It's too flexible for that.

So I have not found a better material for the snap closure than the previously used.